Field sequential color projection display system

Abstract

A field sequential color projection display system, which has high brightness, high accuracy and compact size, and is light and energy saving. The field sequential color projection system comprises: a field sequential beam splitting/combining light valve module including three light valves, which can be controlled by applied energy field, for outputting polarized light of three primary colors in time sequence; a frame sequential display module for respectively displaying frames of three primary colors corresponding to the polarized light of three primary colors output in time sequence, wherein the polarized light passes through the frame sequential display module; a projection lens module for projecting the polarized light passing through the frame sequential display module onto a screen to produce a full color image.

What is claimed is:  
     
       1. A field sequential color projection display system comprising: 
       a field sequential beam splitting/combining light valve module, which can be controlled by applying an energy field, for outputting polarized light of three primary colors in time sequence;  
       a frame sequential display module for respectively displaying frames of three primary colors corresponding to the polarized light of three primary colors output in time sequence, wherein the polarized light passes through the frame sequential display module; and  
       a projection lens module for projecting the polarized light passing through the frame sequential display module onto a screen to produce a full color image;  
       the field sequential beam splitting/combining light valve module comprising:  
       a first polarizing beam splitting device including a first polarizing beam splitting component, a second polarizing beam splitting component and a first light valve, wherein when a broadband incident light is incident to the first polarizing beam splitting component, a first polarized light of a first spectral range is reflected and a second polarized light of the first spectral range and the first polarized light and the second polarized light of other spectral ranges pass through the first polarizing beam splitting component, and when the energy field applied to the first light valve is negative, the first polarized light passing through the first light valve is reflected by the second polarizing beam splitting component, and when the electric field applied to the first light valve is positive the beam with the first polarization of the first spectral range is changed to the second polarization of the first spectral range, the beam passing through the second polarizing beam splitting component and entering into a first black absorber;  
       a second polarizing beam splitting device including a third polarizing beam splitting component, a fourth polarizing beam splitting component and a second light valve, wherein when the first polarized light and the second polarized light of other spectral ranges passing through the first polarizing beam splitting component are incident to the third polarizing beam splitting component, the first polarized light of a second spectral range is reflected and the second polarized light of the second spectral range and the first polarized light and the second polarized light of other spectral ranges except the first spectral range and the second spectral range pass through the third polarizing beam splitting component, and when the energy field applied to the second light valve is negative, the first polarized light of the second spectral range remains the same polarization and is reflected by the fourth polarizing beam splitting component to incorporate the first polarized light of the first spectral range reflected by the first polarizing beam splitting component to be transmitted through a prism, and when the electric field applied to the second light valve is positive the beam with the first polarization of the second spectral range is changed to the second polarization of the second spectral range, the beam passing through the fourth polarizing beam splitting component and entering into a second black absorber; and  
       a third polarizing beam splitting device including a fifth polarizing beam splitting component, a sixth polarizing beam splitting component and a third light valve, wherein when the first polarized light and the second polarized light of other spectral ranges except the first spectral range and the second spectral range passing through the third polarizing beam splitting component is incident to the fifth polarizing beam splitting component, the first polarized light of a third spectral range is reflected and the second polarized light of all spectral ranges passes through the fifth polarizing beam splitting component and enters a third black absorber, and when the energy field applied to the third light valve is negative, the first polarized light of third spectral range remains the same polarization and is reflected by the sixth polarizing beam splitting component after passing through the third light valve to incorporate the first polarized light of the first spectral range and the second spectral range to be emitted from the sixth polarizing beam splitting component, and when the electric field applied to the third light valve is positive the beam with the first polarization of the third spectral range is changed to the second polarization of the third spectral range, the beam passing through the sixth polarizing beam splitting component and entering into a fourth black absorber.  
     
     
       2. A field sequential color projection display system as claimed in  claim 1  wherein the frame sequential display module comprises a condenser lens and a transmit type ferroelectric liquid crystal panel. 
     
     
       3. A field sequential color projection display system as claimed in  claim 1  wherein the frame sequential display module comprises a broadband polarizing beam splitting prism and a reflective type ferroelectric liquid crystal panel. 
     
     
       4. A field sequential color projection display system as claimed in  claim 1  wherein each of the light valves is a ferroelectric liquid crystal component. 
     
     
       5. A field sequential color projection display system as claimed in  claim 1  wherein the applied energy field is a fast alternative positive/negative pulse electric field. 
     
     
       6. A field sequential color projection display system as claimed in  claim 1  wherein each of the polarizing beam splitting component is made of two right-angle prisms having a slope coated with an all-dielectric multi-layer film. 
     
     
       7. A field sequential color projection display system as claimed in  claim 1  wherein the first black absorber is disposed on or near the emerging face of the second polarization beam splitting component. 
     
     
       8. A field sequential color projection display system as claimed in  claim 1  wherein the second black absorber is disposed on or near the emerging face of the forth polarization beam splitting component. 
     
     
       9. A field sequential color projection display system as claimed in  claim 1  wherein the third black absorber is disposed on or near the emerging face of the fifth polarization beam splitting component. 
     
     
       10. A field sequential color projection display system as claimed in  claim 1  wherein the fourth black absorber is disposed on or near the emerging face of the sixth polarization beam splitting component.